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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62691a42c048ce366841d354e0fae50568c38f0a98e44bc8abe6e3b88db1e8d9' 
  AND token = '7zJ9xGE1GlC7WWMt3jdJwlOnlj1PPnOkrscN4UNhhgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}